>  >For what it's worth: http://www.beevital.com/page/pagina-mycostop

This came in a personal email just now:

"... She ran the trial for two months. At the end of the two months the 
level of chalkbrood was well down. Trouble was, it was well down in the 
untreated colonies as well. In fact there was absolutely no difference 
between the treated ones and the untreated. Some of the untreated ones 
had zero chalk at the end (but then one or two did at the start too, and 
it is actually a flaw that we did not treat any chalk free at the start 
colonies) and none of the treated ones had no chalk. Conclusion is that 
we will not invest in Mycostop. Any effect not worth the significant cost."

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